55222331 has 4 divisors (see below), whose sum is σ = 55237200. Its totient is φ = 55207464.

The previous prime is 55222327. The next prime is 55222339. The reversal of 55222331 is 13322255.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13322255 = 5 ⋅2664451.

It is a cyclic number.

It is not a de Polignac number, because 55222331 - 2² = 55222327 is a prime.

It is a super-2 number, since 2×55222331² = 6099011682147122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55222297 and 55222306.

It is not an unprimeable number, because it can be changed into a prime (55222339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3410 + ... + 11048.

It is an arithmetic number, because the mean of its divisors is an integer number (13809300).

Almost surely, 2^55222331 is an apocalyptic number.

55222331 is a deficient number, since it is larger than the sum of its proper divisors (14869).

55222331 is an equidigital number, since it uses as much as digits as its factorization.

55222331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14868.

The product of its digits is 1800, while the sum is 23.

The square root of 55222331 is about 7431.1729222243. The cubic root of 55222331 is about 380.8069900023.

Adding to 55222331 its reverse (13322255), we get a palindrome (68544586).

The spelling of 55222331 in words is "fifty-five million, two hundred twenty-two thousand, three hundred thirty-one".